BBC: As temperatures rise, treelines advance

Trees around the world are colonising new territories in response to higher temperatures. From the US west coast to northern Siberia and south-east Asia, trees are growing at higher elevations, and at higher latitudes as the climate warms. Of 166 sites studied, trees are advancing at more than half, while they are receding at just two sites. The shift is revealed by the first global analysis of treelines published in the journal Ecology Letters.